Sunday
August 2, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Upon decomposition, one sample of magnesium fluoride produced 1.55 kg of Magnesium and 2.42 kg of fluoride. A second sample produced 1.10kg of magnesium. How much fluoride (in grams) did the second sample produced?
Thursday, February 5, 2015 by Sara

chemistry
If 15.0 grams of C3H6, 10.0 grams of oxygen, and 5.00 grams of NH3 are reacted, what mass of acrylonitrile can be produced assuming 100% yield, what mass of the excess reactants remain? 15g C3H6 (1 mol / 42.08 g) = .35 mol C3H6 .36 mol C3H6 ( 2 mol C3H3N / 2 mol C3H6) = .36 ...
Thursday, February 5, 2015 by loulou

chemistry
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = 23.0 kJ, ΔS = 125 J/K, and temperature = 85.0 C.
Thursday, February 5, 2015 by danny

Chemistry
1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration? 2. A mixture of 2 volatile liquids is said to be ideal if each component obeys Raoult’s Law: Pi=XiPio Two volatile ...
Wednesday, February 4, 2015 by Michelle

Chemistry
Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
Wednesday, February 4, 2015 by Jeff

Chemistry
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent column?
Wednesday, February 4, 2015 by Ryan

Chemistry
Once the adsorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop below the top of the adsorbent. Why?
Wednesday, February 4, 2015 by Ryan

Chemistry
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent column?
Wednesday, February 4, 2015 by Ryan

Chemistry
Once the adsorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop below the top of the adsorbent. Why?
Wednesday, February 4, 2015 by Ryan

Chemistry
the titration of an ascorbic acid requires 18.5 mL of .0105 M KIO3. how many mmol of ascorbic acid were in this sample?
Wednesday, February 4, 2015 by Julia

chemistry
a pool is 39.8 m long and 28.2 m wide. if the average depth of water is 4.90 ft, what is the mass (in kg) of water in the pool? enter your answer in scientific notation. the density of water is 1.0 g/mL
Wednesday, February 4, 2015 by Sabrina

Chemistry
Calculate the ΔHrxn for the following reactions using the heats of formation given in the table at the end of this assignment: a)The complete combustion of methane, CH4, producing water as a liquid. b)The complete combustion of glucose, C6H12O6, producing water as a ...
Wednesday, February 4, 2015 by Beth

Chemistry
Which of the following is an example of a double-displacement reaction? AlCl3 + 3 NaOH → Al(OH)3 + 3 NaCl Na2O + H2O → 2 NaOH CuCO3 → CuO + CO2 None of the above are examples of double-displacement. A Which of the following is a double-displacement reaction...
Wednesday, February 4, 2015 by Robb4301

chemistry
What is the hydrocarbon that will not form an additional polymer A compound which is not a hydrocarbon but will form an additional polymer
Wednesday, February 4, 2015 by Victoria

Chemistry
a sample of radioisotope has a count rate measured by a Muller-Geiger counter of 160 counts per minute. this drop to 20 counts per minute in 1 hour. What is the half life of this source.
Wednesday, February 4, 2015 by Victoria

Chemistry
If 3.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under the same conditions? 2 CO (g) + O2 (g) ---> 2 CO2 (g)
Wednesday, February 4, 2015 by Jess

Chemistry
If a temperature increase from 11.0∘C to 22.0∘C doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?
Wednesday, February 4, 2015 by Anonymous

chemistry
The question is: What statements are true for the standard entropy change for the conversion of ozone to oxygen? The choices to pick from are: 1. Molecular factors predict an increase in entropy 2. Stoichiometric factors predict a decrease in entropy. 3. Molecular factors ...
Wednesday, February 4, 2015 by mar

chemistry
In an adiabatic calorimetry experiment, 100 mL of 0.500 M HCl was added to 100 mL 0.500 M NaOH to produce 200 mL 0.25 M NaCl. A temperature increase of 3.38 °C was measured. Calculate the heat of reaction associated with this process at 25 °C from the data in Table 1...
Wednesday, February 4, 2015 by kjhytrew

Chemistry
The ksp for Ce(IO3)3 is 3.2E-10. What is Ce^3+ concentration in a solution prepared by mixing 60ml of 0.025M Ce^3+ with 40ml of 0.045M IO3^-?
Wednesday, February 4, 2015 by Kyle

Chemistry Please help !
Carbon tetrachloride contains one carbon and four chlorine atoms. For this compound 11.818 g of chlorine combine with 1.000 g of C-12. Using this information, calculate the atomic mass of chlorine.
Wednesday, February 4, 2015 by Brian

chemistry
I need to do this question but um unable to draw the enthalpy cycle please help me. The standard enthalpy of combustion of C3H7OH(l), C(s,graphite) and H2(g) are -1300,-393, and -286 kJmol-1. Calculate the standard enthalpy of formation of C3H7OH(l)
Wednesday, February 4, 2015 by isu

Chemistry due soon
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Tuesday, February 3, 2015 by Morgan

chemistry
What happens when calcium is inserted in a gas jar of nitrogen? How will you test the product formed?
Tuesday, February 3, 2015 by abbott

chemistry
What happens when calcium is inserted in a gas jar of nitrogen.? How will you test the product formed
Tuesday, February 3, 2015 by abbott

chemistry
How to test calcium nitride.? ( ca3n2) when calcium reacts with nitrogen , Calcium nitride is formed. How can we test that the product formed is calcium nitride?
Tuesday, February 3, 2015 by saurav

Chemistry
Cola drinks have a phosphoric acid content that is described as `from 0.057% to 0.084% of 75% phosphoric acid, by mass." Estimate the pH range of cola drinks corresponding to this average range of H3PO4 content. I am having trouble with the wording of this question, I ...
Tuesday, February 3, 2015 by Ken

Chemistry
Calculate the amount of heat required to heat a50kg sample of ethanol from 13.0∘C to 18.0∘C Specific heat capacity of ethanol is 2.42 J/g∘C.? Please help
Tuesday, February 3, 2015 by Eduardo

chemistry
1. Write the electron configuration for each atom or ion. Then explain the distribution of electrons among energy levels. Ca, Be2+, and Br- I already found the electron configurations but I don't understand the second part of the question.(Then explain the distribution of ...
Tuesday, February 3, 2015 by Morgan

chemistry
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Tuesday, February 3, 2015 by Morgan

Organic Chemistry TLC Chromatography
If you have 5.6 ml of 95:5 ethyl acetate, how many ml of 85:15 ethyl acetate can you make? Assume unlimited supply of pure ethyl acetate.
Tuesday, February 3, 2015 by Joseph

chemistry
A method for scrubbing CO2(g) from the air on a spacecraft is to allow CO2(g) to react with NaOH according to the following (unbalanced reaction). NaOH(s) + CO2(g) → Na2CO3(s) + H2O(l) Use the appropriate thermodynamic tables to calculate the enthalpy, entropy and ...
Tuesday, February 3, 2015 by Boris

Chemistry
The coinage metals -- copper, silver, and gold -- crystallize in a cubic closest packed structure. Use the density of gold (19.3 g/cm3) and its molar mass (197 g/mol) to calculate an approximate atomic radius for gold. Work So Far: {[1/(19.3x197)]x.74}/6.022e23 =3.2319e18 [(3....
Tuesday, February 3, 2015 by Caroline

Chemistry
Benzene has a vapor pressure of 183 mm Hg at 40 degrees Celsius. Taking it's heat of vaporization to be 30.8 kJ/mol, calculate it's vapor pressure at 25 degrees Celsius. The answer is 101 mm Hg, but I keep getting 4.613, and I can't figure out where 101 mm Hg comes...
Tuesday, February 3, 2015 by Jessica

chemistry
Need help stepping through this for a review. I need to prepare 40grams of a 29% sugar solution. How do I calculate how much sugar and how much water is needed? Was given this formula: weight% (w/w)=100 * (mass of solute/total mass of solution) I set up my problem: .29 = 100...
Tuesday, February 3, 2015 by j3z

chemistry
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = -95.0 kJ, ΔS = 217 J/K, and temperature = 160 C.
Tuesday, February 3, 2015 by danny

chemistry
How many core electrons are there in a ground state phosphorus atom?
Tuesday, February 3, 2015 by danny

chemistry
How can you test calcium nitride.. ( Ca3N2) I have written the reaction between calcium and nitrogen. A question that says " how will you test the product formed " is given. SO can you please help me, How can you test calcium nitride?
Tuesday, February 3, 2015 by saurav

General Chemistry
1,When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a soHowever, when additional aqueous hydroxide is added the precipitate redissolves forming a soluble [Pb(OH)4]2–(aq) complex ion.lid precipitate forms. 2,The Ksp of strontium carbonate, ...
Tuesday, February 3, 2015 by jay adams

Chemistry
The temperature of an object increases by 44.9 °C when it absorbs 3871 J of heat. Calculate the heat capacity of the object.
Tuesday, February 3, 2015 by Samantha

Chemistry
How much ethylene glycol (C2H6O2, the major component of antifreeze) must be added to 1 L of water to keep it from freezing at -20 oC? Kf = 1.86 oC/m.
Tuesday, February 3, 2015 by Sheila

chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.13 moles of KOH into 760 mL of solution. What is the pH of this buffer? Ka = 3.3 × 10−6 for HA.
Monday, February 2, 2015 by kc

chemistry
For the equilibrium below at 400 K, Kc = 7.0. Br2(g) + Cl2(g) equilibrium reaction arrow 2 BrCl(g) If 0.85 mol of Br2 and 0.85 mol Cl2 are introduced into a 2.0 L-container at 400. K, what will be the equilibrium concentrations of Br2, Cl2 and BrCl? I tried to set it up and ...
Monday, February 2, 2015 by me

chemistry
The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 ∘C. The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/g⋅K and 0.67 J/g⋅K, respectively. The heat of vaporization for the compound is 27.49 kJ/mol. Calculate the heat required to ...
Monday, February 2, 2015 by Tori

chemistry
After you carefully lower each cube into the water of its own cylinder, what will the new water level be in the cylinder with the lead cube?
Monday, February 2, 2015 by Anonymous

Chemistry
A certain reaction has an activation energy of 58.80 kJ/mol. At what Kelvin temperature will the reaction proceed 6.50 times faster than it did at 303 K?
Monday, February 2, 2015 by Sam

Chemistry
Balance Fe2O3 + CO--> Fe + CO2
Monday, February 2, 2015 by Meredith G.

Chemistry
Your computer monitor has a width of 14.56 inches and a height of 10.92 inches. What is the area of the monitor display in square meters?
Monday, February 2, 2015 by Samantha

Chemistry
What is the mass, in grams, of a pure iron cube that has a volume of 4.30 cm3?
Monday, February 2, 2015 by Samantha

Organic Chemistry
If you have 5.6 mL of 95% hexanes to 5% ethyl acetate, how many mL of 85% hexanes to 15% ethyl acetate can you make? Assume unlimited supply of pure ethyl acetate.
Monday, February 2, 2015 by Dylan

Inorganic Chemistry
Use Slater's rules to calculate the effective nuclear charge, Z* or Zeff, for a 4f electron in Eu, Tb, and Dy.
Monday, February 2, 2015 by Dylan

Chemistry
for the titration of n.89g of an uk diaprotic acid with .2500 N sodium hydroxide, it took 35.5 mL to reach the phenolphthalein endpoint, calculate the molar mass.
Monday, February 2, 2015 by Amberra

chemistry
Why would a unknown solid cube sink in cholorform that has a density of 1.489
Monday, February 2, 2015 by amy

chemistry
In 100 mL of distilled water,1.0g of thallium cholirde is added. How much of the 1.0g of TlCl doen't dissolve? The Ksp of TlCl is 3.6 x 10-6
Monday, February 2, 2015 by ryan

chemistry
Please help !? Knowing that the concentration of Ag+ in a silver chromate solution is 1.5 x 10-3 M, calculate its solubility product at 25°C.
Monday, February 2, 2015 by ryan

chemistry
Stuck on this one please help ! The solubility of barium sulphate, BaSO4, is 2.4 x 10-4 g/100 mL of solution. Calculate the Ksp of this solution.
Monday, February 2, 2015 by ryan

Integrated Physics and Chemistry
What are a few of the positive things the Equal Rights Amendment would have done for women in America?
Monday, February 2, 2015 by Misty

Chemistry- sig figs
0.2748 Is my answer and the problem is sig figs... The question have two sig figs so would it be .27 or .28?
Monday, February 2, 2015 by Asher

chemistry
what does copper look like under normal condition(solid,liquid,gas,color,etc)
Monday, February 2, 2015 by anonymous

Chemistry
Calculate the ΔHrxn for the following reactions using the heats of formation given in the table at the end of this assignment: a)The complete combustion of methane, CH4, producing water as a liquid. b)The complete combustion of glucose, C6H12O6, producing water as a ...
Monday, February 2, 2015 by Abby K.

oragnic chemistry
convert the measurement 92.0g into pounds (1lb=453.6g)
Monday, February 2, 2015 by Anonymous

chemistry
A chemist used 500g of glucose(c6H12o6)in a preparation of a drug in the laboratory how many moles was used?
Monday, February 2, 2015 by Anonymous

Chemistry
Which of the following general equations describes all decomposition reactions? decompo single double A 2N2O5 → O2 + 4NO2 Is what type of chemical reaction? Combustion Synthesis Decomposition None of the above. not sure Which of the following is a decomposition reaction...
Monday, February 2, 2015 by Robb4301

Chemistry
Decomposition reactions result in __________ compounds. bigger smaller not sure
Monday, February 2, 2015 by Robb4301

Chemistry
(a) What type of ion chromatography (cation or anion) will you use to separate the following ions: Cu2+, Fe3+, Ag+ and Na+ . I'm having trouble here as I know that in elution chromatography they use like charges to separate ions, but is that the same case in ion-exchange...
Monday, February 2, 2015 by Jacob

Chemistry
How do you change 15% to moles
Sunday, February 1, 2015 by Jenna

chemistry
In 100 mL of distilled water,1.0g of thallium cholirde is added. How much of the 1.0g of TlCl doen't dissolve. The Ksp of TlCl is 3.6 x 10-6.
Sunday, February 1, 2015 by ryan

chemistry
Please help?! if 600 mL of a 0.04M KCl solution is mixed with 50mL of a 0.03M Na2SO4 solution, will a precipitate be formed? Explain your reasoning and/or show all calculations?
Sunday, February 1, 2015 by ryan

chemistry
I have no idea how to go about this question, please help! A clumsy chemist accidentally pours 100 mL of a 0.004 M Na2SO4 solution into a beaker containing 500 mL of 0.050 M CaCl2. Will a precipitate be formed? Explain your reasoning and/or show all calculations?
Sunday, February 1, 2015 by ryan

chemistry
Stuck on this questions ?! please help The solubility of barium sulphate, BaSO4, is 2.4 x 10-4 g/100 mL of solution. Calculate the Ksp of this solution.
Sunday, February 1, 2015 by ryan

Chemistry
Determine the molarity of a 15.0 % by mass Hydrogen Peroxide solution. The density of Hydrogen Peroxide is 1.054 g/mL. The 15.0% by mass can be broken apart into 15.0 g Hydrogen Peroxide and 100.0 g solution. Use the density of Hydrogen Peroxide solution (1.054 g/mL) to ...
Sunday, February 1, 2015 by Jenna

Chemistry
Determine the number of grams of Potassium Iodate present in 10.0 g of a 0.267 m Potassium Iodate solution.
Sunday, February 1, 2015 by Bethany

Chemistry
The age of wine can be determined by measuring the trace amount of radioactive tritium, 3H, present in a sample. Tritium is formed from hydrogen in water vapor in the upper atmosphere by cosmic bombardment, so all naturally ocurring water contains a small amount of this ...
Sunday, February 1, 2015 by Anonymous

Chemistry Rate Reaction
What is the rate of the reaction: H2SeO3 + 6I- + 4H+ Se + 2I3- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 10^5 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are [H2SeO3] = 1.5 × 10^-2 M, [I-] = 2.4 × 10^-3 M, [H...
Sunday, February 1, 2015 by Jenny

Chemistry
If you had a mixture of sodium chloride and sodium bromide, could you use its conductance to determine the concentration of each solute? Explain.
Sunday, February 1, 2015 by Mary

Chemistry
Determine the moles of Potassium Iodate present in a 0.267 m Potassium Iodate solution assuming you have 1 kg of solvent (H2O) present.
Sunday, February 1, 2015 by Jenna

Chemistry
Determine the mass (in grams) of a 1% solution of Manganese(II) Sulfate that will contain 0.0403 grams.
Sunday, February 1, 2015 by Bethany

chemistry II
What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is the percentage by mass of acetic acid solution? The density of acetic acid is 1.06 g/ml
Sunday, February 1, 2015 by Steph

chemistry
In an acid-base titration, 33.12ml of 0.1177 M H2C2O4 was titrated with 0.2146 M NaOH to the end point. What volume of the NaOH solution was used?
Sunday, February 1, 2015 by Steph

Chemistry
Determine the mass (in grams) of Malonic Acid (C3H4O4) present in 10.0 mL of a 0.200 M solution.
Sunday, February 1, 2015 by Amanda

chemistry
how many moles are present in 2.45 x 10²³ molecules CH₄?
Sunday, February 1, 2015 by may

Chemistry
The formation constant of [M(CN)4]^-2 is 7.70 × 10^16, where M is a generic metal. A 0.150-mole quantity of M(NO3)2 is added to a liter of 0.840 M NaCN solution. What is the concentration of M2 ions at equilibrium?
Sunday, February 1, 2015 by shyamjp

Chemistry
Can someone please help me solve this problem? Calculate the solubility of Ba3(PO4)2 in water. For Ba3(PO4)2, Ksp = 1.3 x 10- 29 Thank you!
Sunday, February 1, 2015 by Anonymous

chemistry
sucrose change of H is -2226.1kj/mol fructose change of H is -1265.6KJ/mol calculate the enthalpy change for the hydrolysis reaction of sucrose. sucrose + H2O(l)-> C6H12O6(s)+Fructose Is it just the products-reactants?? I'm confused.
Sunday, February 1, 2015 by mar

chemistry
Co2(aq)->Co2(g) calculate the free-energy change for this reaction at 25 degrees Celsius.
Sunday, February 1, 2015 by mar

chemistry
what statements are true for the standard entropy change for the conversion of ozone to oxygen? Select all the apply? 2 O_3 (g) > 3 O_2 (g) Molecular factors predict an increase in entropy Stoichiometric factors predict a decrease in entropy. Molecular factors predict a ...
Sunday, February 1, 2015 by mar

Chemistry
Estimate the rate of the reaction, H2SeO3 + 6I- + 4H+ Se + 2I3- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 10^5 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are [H2SeO3] = 1.5 × 10^-2 M, [I-] = 2.4 × 10^-3 M, [H...
Sunday, February 1, 2015 by Is my answer right?

chemistry
5.6g of organic compound on burning with exess oxygen gave 17.6g of CO2 and 7.2g of H2O .the organic compound
Sunday, February 1, 2015 by Anonymous

chemistry
The following experimental data were obtained for the reaction; 2 NO + 2 H2 ¡æ N2+ 2 H2O Rate/10-5M/s [NO]/10-2M [H2]/10-2M 0.50 0.50 0.20 2.00 1.00 0.20 0.25 0.25 0.40 Write a rate law in agreement with the data. Rate = What is the value and units of the rate ...
Sunday, February 1, 2015 by jhon

Chemistry
The primary route for making copper iodide is by reacting potassium iodide with copper sulfate: 2CuSO4 + 4KI + 2Na2S2O3 ==> 2CuI + 2K2SO4 + 2NaI + Na2S4O6 Identify potential green chemistry and green engineering challenges of the reaction.
Sunday, February 1, 2015 by Henry

chemistry
A sample of 131 I was purified and then analyzed for iodine content. It was found that the sample was 99.8% pure. 25 hours later the sample was tested again and it was found that the sample was now just 78.2% pure. What is the half - life of 131 I?
Sunday, February 1, 2015 by zac

Chemistry
Estimate the rate of the reaction, H2SeO3 + 6I^- + 4H^+ --> Se + 2I3^- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 105 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are: [H2SeO3] = 1.5 × 10-2 M [I-] = 2.4 × 10-...
Sunday, February 1, 2015 by Anonymous

chemistry
Calculate the ΔH of reaction for: C2H4(g) + H2O(l) = C2H5OH(l) if the ΔH of formation for C2H4(g), H2O(l) and C2H5OH are +52, -286 and -278 kJ/mol, respectively? Enter a numerical value below and be sure to include a minus sign if needed. The error interval is +/- 5 ...
Saturday, January 31, 2015 by danny 16

chemistry
Welders often use acetylene torches heat up the metal. The reaction is: C2H2(g) + 2.5O2(g) = 2CO2(g) + H2O(g) Calculate the ΔH of reaction for this reaction.
Saturday, January 31, 2015 by danny 16

chemistry
Given: Equation #1: 4NH3(g) + 5O2(g) = 4NO(g) + 6H2O; ΔH of reaction = -1170 kJ Equation #2: 4NH3(g) + 3O2(g) = 2N2(g) + 6H2O; ΔH of reaction = -1530 kJ Then what is the ΔH of reaction for: N2(g) + O2(g) = 2NO(g)? Enter a numerical value below and be sure to ...
Saturday, January 31, 2015 by danny

chemistry
Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for: CaC2(s) + 2H2O(l) = Ca(OH)2(s) + C2H2(g) is -127 kJ, then what is the enthalpy of formation for calcium carbide? The ΔH of formation for H2O(l), Ca(...
Saturday, January 31, 2015 by danny

chemistry
Suppose that your morning shower is 7 minutes long and uses 4 gallons of water per minute that is a nice 102 F in temperature. How much energy (kJ) must be used to heat the water for your shower if the water coming into your house is at 60 F? The heat capacity of water is 4....
Saturday, January 31, 2015 by danny

chemistry
Suppose you add 92 ml of dilute acid to 46 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 39 C. How much energy (in kJ) was released by the dissolution of the acid if the specific heat ...
Saturday, January 31, 2015 by danny

Chemistry
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Saturday, January 31, 2015 by Morgan

chemistry
2C2H2(g) + 5O2(g)→4CO2(g) + 2H2O(g) a. Determine the enthalpy change for the reaction. ΔH = (4(-393.5)+ 2(-241.8)) – (2(227) + 5(0)) The enthalpy change is -2511.6. b. Determine the entropy change for the reaction. ΔS = (4(213.7)+ 2(188.7)) – (2(200.9...
Saturday, January 31, 2015 by Morgan

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